ZF 4143.351.021 OUTER CLUTCH DISK for HL 100/HL 270 | OEM Genuine Part

Overview

The ZF 4143.351.021 OUTER CLUTCH DISK is a critical friction component engineered for the HL 100 and HL 270 series transmissions. This OEM genuine part sits within the clutch pack assembly, where it transfers torque between rotating elements during gear engagement. The SKU 4143.351.021 is specifically designed to withstand high thermal loads and repetitive pressure cycles, ensuring consistent power delivery in heavy-duty industrial applications. When installed alongside the 4143101009 HOUSING and 4143301025 HOUSING, this disk maintains proper clearance and alignment within the clutch drum.

Symptoms of Failure

• Erratic gear engagement or slipping under load – Worn friction material on the outer clutch disk reduces clamping force, causing the transmission to slip when shifting from neutral to drive or during heavy torque demands.
• Delayed shift response in HL 100/HL 270 transmissions – As the disk wears, hydraulic pressure takes longer to build, resulting in a noticeable lag between gear selection and actual engagement.
• Metallic grinding or chattering noises – Degraded friction surfaces allow metal-on-metal contact, producing audible vibrations that worsen with transmission temperature.
• Burnt transmission fluid odor – Overheated clutch disks generate excessive friction, breaking down the fluid and producing a distinct acrid smell during operation.

Technical Specifications

Compatibility

This outer clutch disk is directly compatible with ZF transmission models that utilize the HL 100 and HL 270 series clutch packs. Specifically, it fits the WG180, WG200, and WG210 series transmissions, as well as earlier variants of the 4WG-180 and 4WG-200 systems. For proper sealing, always pair this disk with a new 0634313603 O-RING and verify housing integrity using the 4475280018 SCREW PLUG to prevent fluid bypass.

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